<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Emmet 写法</title>
  <style>
    div {
      width: ;
      height: ;
      width: 500px;
      background-color: #fff;
      width: 500px;
      height: 200px;
      background-color: #fff;
    }
  </style>
</head>
<body>
  <div></div>
  <p class="box"></p>
  <div class="box"></div>
  <p id="box"></p>

  <div></div>
  <p></p>

  <div>
    <p></p>
  </div>

  <span></span><span></span><span></span>

  <div>111</div>
</body>
</html>